Tyvek packaging product air tightness test cavity

Abstract

The utility model belongs to the field of Tyvek paper packaging tightness test, and particularly discloses a Tyvek packaging product air tightness test cavity which comprises an upper cavity, a lower cavity, a pressing plate, a rubber pad, a test sample and Tyvek paper, and is characterized in that the pressing plate, the rubber pad and the upper cavity are combined to form a rubber convex surface; in the testing process, the Tyvek paper expands due to the internal and external pressure difference, the rubber convex face is attached to the Tyvek paper through the gravity of the upper cavity, air circulation of the Tyvek paper can be effectively blocked, deformation of the Tyvek paper is greatly reduced, and due to the fact that the Tyvek paper has the characteristic of air permeability, the structure effectively solves the problem that the Tyvek paper has interference on detection data results, and the detection accuracy is improved. The rubber convex surface is perfectly attached to the Tyvek paper, the possibility that the Tyvek paper is broken due to excessive deformation is avoided, the rubber pad is in contact with the boss to form a sealed cavity, a closed detection cavity environment is formed in the lower cavity, the structure is ingeniously used, the soft rubber has the advantage of good compliance, and the sealing effect is guaranteed.

Description

A test chamber for the airtightness of Tyvek packaging products Technical Field

[0001] This utility model relates to the field of airtightness testing of Tyvek paper packaging, specifically a test chamber for airtightness of Tyvek packaging products. Background Technology

[0002] Tyvek, commonly known as "tear-resistant," is a high-density polyethylene fiber material manufactured by DuPont. It combines the characteristics of paper, cloth, and film: thinness, light weight, softness, smoothness, opacity, water resistance, and low surface friction. Therefore, it is currently recognized as the best medical packaging material. It offers excellent biocompatibility, dust-free peeling, high added value, high tear strength, high burst resistance, high sealing power, long antibacterial life (over 5 years), high breathability (reducing condensation at extreme temperatures), and enhanced safety. Suitable for packaging Class II and Class III medical devices. (Currently the best medical packaging material for dialysis.)

[0003] A packaging system refers to the sum of all packaging components that contain and protect a pharmaceutical product, including packaging components that come into direct contact with the product and secondary packaging components. This primarily applies to packaging systems for injectable chemical drugs. The packaging system for injectable drugs should maintain the integrity of the product contents while preventing microbial contamination.

[0004] Package integrity, also known as container-closure integrity, refers to the ability of a packaging system to prevent loss of contents and microbial intrusion, ensuring that the drug continues to meet safety and quality requirements. A package integrity test (CCIT), or container-closure integrity test, detects any breaks or gaps in the packaging to determine the size and / or location of any leaks.

[0005] The vacuum attenuation method uses the pressure difference between the inside and outside of the product to determine if it is leaking. Tyvek paper is permeable, making it impossible to determine whether the pressure change originates from packaging damage or the permeability of the Tyvek paper using conventional methods. This invention effectively seals off the permeability of the Tyvek paper, thereby achieving a detection and separation effect. Summary of the Invention

[0006] The purpose of this invention is to provide a test chamber for the airtightness of Tyvek packaging products, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a Tyvek packaging product airtightness test chamber, comprising an upper chamber and a lower chamber disposed at the upper and lower ends, a rubber pad located between the upper chamber and the pressure plate, a test sample placed inside the lower chamber, and Tyvek paper placed on the upper surface of the test sample.

[0008] A vent hole is provided at the center of the upper cavity, a threaded hole is provided at the bottom of the upper cavity, and countersunk screw through holes are provided at the rubber pad and the pressure plate. The screw passes through the pressure plate and the rubber pad in sequence to connect with the upper cavity. A square hollow is provided at the center of the pressure plate.

[0009] The test sample is placed in the chamber at the center of the lower cavity; a boss is provided on the upper surface of the lower cavity along the outer edge of the chamber, the boss is inserted into the square cutout and contacts the lower surface of the rubber pad, the upper surface of the Tyvek paper contacts the lower surface of the rubber pad, and a gap is left between the test sample and the inner side of the chamber for airflow.

[0010] Preferably, the square cutout at the center of the pressure plate has rounded corners on all four sides, the thickness of the square cutout matches the height of the boss, and the rubber pad is made of silicone rubber.

[0011] Preferably, the threaded holes at the bottom of the upper cavity correspond one-to-one with the countersunk screw through holes on the rubber pad and the pressure plate, and are connected by screws to form a rubber convex surface at the bottom of the rubber pad.

[0012] Preferably, the inner side of the upper surface of the boss is provided with a semi-circular groove, the boss is flush with the upper surface of the Tyvek paper, the rubber pad contacts the boss to form a sealed cavity, and a detection hole is provided on one side of the lower cavity.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: The rubber convex surface formed by the combination of the pressure plate, rubber pad, and upper cavity allows the Tyvek paper to expand due to the internal and external pressure difference during testing. The rubber convex surface, held in place by the gravity of the upper cavity, effectively blocks gas flow through the Tyvek paper and significantly reduces its deformation. Because Tyvek paper is permeable, this structure effectively solves the problem of this characteristic interfering with the test data. The perfect fit between the rubber convex surface and the Tyvek paper prevents the paper from cracking due to excessive deformation. The rubber pad and the convex surface form a sealed chamber, creating a closed testing environment within the lower cavity. This structure cleverly utilizes the good adaptability of relatively soft rubber, ensuring a sealing effect. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 is a cross-sectional view of the overall structure of this utility model.

[0016] In the diagram: 1. Lower chamber; 2. Upper chamber; 3. Pressure plate; 4. Rubber pad; 5. Test sample; 6. Screw; 7. Vent hole; 8. Chamber; 9. Tyvek paper; 10. Boss; 11. Radius; 12. Semicircular groove; 13. Detection hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Please refer to Figures 1-2. This utility model provides a technical solution: a Tyvek packaging product airtightness test chamber, including an upper chamber 2 and a lower chamber 1 disposed at the upper and lower ends, a rubber pad 4 located between the upper chamber 2 and the pressure plate 3, a test sample 5 placed inside the lower chamber 1, and Tyvek paper 9 placed on the upper surface of the test sample 5.

[0021] The upper cavity 2 is provided with a vent hole 7 at the center, and a threaded hole is provided at the bottom of the upper cavity 2. The rubber pad 4 and the pressure plate 3 are provided with countersunk screw through holes. The screw 6 passes through the pressure plate 3 and the rubber pad 4 in sequence and connects to the upper cavity 2. The pressure plate 3 is provided with a square hollow in the center.

[0022] The test sample 5 is placed in the chamber 8 at the center of the lower cavity 1; a boss 10 is provided on the upper surface of the lower cavity 1 along the outer edge of the chamber 8, the boss 10 is inserted into the square hollow and contacts the lower surface of the rubber pad 4, the upper surface of the Tyvek paper 9 contacts the lower surface of the rubber pad 4, and a gap is left between the test sample 5 and the inner side of the chamber 8 for airflow.

[0023] Furthermore, the square hollow in the center of the pressure plate 3 has rounded corners 11 on all four sides. The thickness of the square hollow matches the height of the boss 10. The rubber pad 4 is made of silicone rubber with a hardness of 20A. The softer hardness of the rubber has better adaptability.

[0024] Furthermore, the threaded holes at the bottom of the upper cavity 2 correspond one-to-one with the countersunk screw through holes on the rubber pad 4 and the pressure plate 3, and are connected by screws 6 to form a rubber convex surface at the bottom of the rubber pad 4.

[0025] Furthermore, the inner side of the upper end face of the boss 10 is provided with a semi-circular groove 12. The boss 10 is flush with the upper surface of the Tyvek paper 9. The rubber pad 4 contacts the boss 10 to form a sealed cavity. One side of the lower cavity 1 is provided with a detection hole 13.

[0026] Chamber 8 is precisely dimensionally calculated and simulated to ensure a close fit with the test sample 5. During testing, this ensures that the Tyvek paper 9 and the rubber pad 4 are fully compressed and their convex surfaces adhered, effectively mitigating the interference of the Tyvek paper's permeability on the test data while minimizing residual space. (The larger the residual space, the worse the test results.)

[0027] The precise dimensional calculation and 3D simulation of the dimensions of the chamber 8 are mature technologies in this field and will not be described in detail here.

[0028] Working principle:

[0029] Vacuuming is performed in the chamber through the detection hole 7. At this time, the internal pressure of the test sample 5 is greater than the external pressure (chamber), causing the Tyvek paper 9 to expand. After the Tyvek paper 9 expands, it adheres to the rubber convex surface formed by the sealing gasket 4, preventing the Tyvek paper from deforming further and sealing its surface.

[0030] This invention utilizes a rubber convex surface formed by the combination of pressure plate 3, rubber pad 4, and upper cavity 2. During testing, the Tyvek paper 9 expands due to the internal and external pressure difference. The rubber convex surface adheres to the Tyvek paper 9 under the weight of the upper cavity, effectively blocking gas flow and significantly reducing deformation. Because Tyvek paper 9 is permeable, this structure effectively solves the problem of this characteristic interfering with the test data. The perfect fit between the rubber convex surface and the Tyvek paper 9 prevents the possibility of breakage due to excessive deformation. The rubber pad 4 contacts the protrusion 10 to form a sealed chamber, creating a closed testing chamber environment in the lower cavity 1. This structure cleverly utilizes the good adaptability of relatively soft rubber, ensuring a sealing effect. The ingenious design generates compression deformation, achieving an ideal testing environment and making the test results more stable.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test chamber for the airtightness of Tyvek packaging products, characterized in that: The system includes an upper cavity (2) and a lower cavity (1) located at the upper and lower ends, a rubber pad (4) located between the upper cavity (2) and the pressure plate (3), a test sample (5) placed inside the lower cavity (1), and Tyvek paper (9) placed on the upper surface of the test sample (5). A vent hole (7) is provided at the center of the upper cavity (2), and a threaded hole is provided at the bottom of the upper cavity (2). Countersunk screw through holes are provided at the rubber pad (4) and the pressure plate (3). The screw (6) passes through the pressure plate (3) and the rubber pad in sequence. (4) Connected to the upper cavity (2), the pressure plate (3) has a square hollow in the center; the test sample (5) is placed in the chamber (8) at the center of the lower cavity (1); a boss (10) is provided on the upper surface of the lower cavity (1) along the outer edge of the chamber (8), the boss (10) is inserted into the square hollow and contacts the lower surface of the rubber pad (4), the upper surface of the Tyvek paper (9) contacts the lower surface of the rubber pad (4), and the test sample (5) and the inner side of the chamber (8) have a gap for airflow.

2. The airtightness testing chamber for Tyvek packaging products according to claim 1, characterized in that: The square hollow in the center of the pressure plate (3) has rounded corners (11) on all four sides. The thickness of the square hollow matches the height of the boss (10). The rubber pad (4) is made of silicone rubber.

3. The airtightness testing chamber for Tyvek packaging products according to claim 1, characterized in that: The threaded hole at the bottom of the upper cavity (2) corresponds one-to-one with the countersunk screw through hole positions of the rubber pad (4) and the pressure plate (3). The screw (6) is used to squeeze and connect the rubber pad (4) to form a rubber convex surface at the bottom.

4. The airtightness testing chamber for Tyvek packaging products according to claim 1, characterized in that: The inner side of the upper end face of the boss (10) is provided with a semi-circular groove (12). The boss (10) is flush with the upper surface of the Tyvek paper (9). The rubber pad (4) contacts the boss (10) to form a sealed chamber. The lower cavity (1) is provided with a detection hole (13) on one side.

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